IED
ZB
Line impedance = ZC
ZA = forward source impedance
IEC07000014_2_en.vsd
IEC07000014 V2 EN-US
Figure 137: Line application of pole slip protection
If the apparent impedance crosses the impedance line ZB – ZA this is the detection
criterion of out of step conditions, see figure
138.
Section 8 1MRK 502 071-UUS A
Impedance protection
286 Generator protection REG670 2.2 ANSI and Injection equipment REX060, REX061, REX062
Application manual
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